Note 16 - Fair Value Measurements - Impaired Loans and Other Real Estate Owned Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Impaired loans net of valuation allowance	$ 878	$ 2,328
Other real estate owned net of valuation allowance	3,156	4,165
Fair Value, Inputs, Level 1 [Member]
Impaired loans net of valuation allowance	0	0
Other real estate owned net of valuation allowance	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans net of valuation allowance	0	0
Other real estate owned net of valuation allowance	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans net of valuation allowance	878	2,328
Other real estate owned net of valuation allowance	$ 3,156	$ 4,165